deutsche-glasfaser.de

Checked 21 October 2026, 22:13 UTC · via 8.8.8.8
!Passed with warnings
20 passed 3 warnings 0 failed 6 info

Registration

info

.de country-code

Found

TLD
.de (country-code)
ICANN policies apply
no

Checks

  • i
    .de is a country-code TLD (ccTLD)
    Country-code TLD: governed by its local registry under national policy, not by an ICANN contract. Registrar accreditation, dispute resolution and RDAP/WHOIS rules are set by the registry.
    #1
  • ✓ TLD delegated and signed #2
    .de is delegated in the root zone and DNSSEC-signed.
  • i
    Registration data not available
    No registration data via RDAP: the registry of .de offers no RDAP service. Many ccTLD registries don't offer RDAP; check the registry's WHOIS instead.
    #3

Delegation

info

dnsauth001.dg-w.de, dnsauth002.dg-w.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dnsauth001.dg-w.de, dnsauth002.dg-w.de
NS in the zone
dnsauth001.dg-w.de, dnsauth002.dg-w.de
NameserverAddressesNetwork (AS)Glue
dnsauth001.dg-w.de185.22.142.3 2a00:6020:0:30::3AS60294 DE-DGW - Deutsche Glasfaser Wholesale GmbH, DE AS60294 DE-DGW - Deutsche Glasfaser Wholesale GmbH, DE185.22.142.3 2a00:6020:0:30::3
dnsauth002.dg-w.de94.31.64.49 2a03:fc0::AS60294 DE-DGW - Deutsche Glasfaser Wholesale GmbH, DE AS60294 DE-DGW - Deutsche Glasfaser Wholesale GmbH, DE94.31.64.49 2a03:fc0::

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: dnsauth001.dg-w.de, dnsauth002.dg-w.de.
    #6
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ No glue needed #8
    All nameservers are outside the zone, so no glue records are needed.
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • ✓ Nameservers in different networks #10
    The nameservers are spread over 2 IPv4 /24s and 2 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS60294 (DE-DGW - Deutsche Glasfaser Wholesale GmbH, DE): 4 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • i
    All nameserver names under .de
    All nameserver names are under one TLD, so a problem with that TLD also makes the nameservers unreachable. Some operators use names under two TLDs for extra resilience.
    #12
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dnsauth001.dg-w.de 185.22.142.3NOERROR, 8 ms, authoritativenoyes / yesrefusedKnot DNS 3.4.11
dnsauth001.dg-w.de 2a00:6020:0:30::3NOERROR, 8 ms, authoritativenoyes / yesrefusedKnot DNS 3.4.11
dnsauth002.dg-w.de 94.31.64.49NOERROR, 7 ms, authoritativenoyes / yesrefusedKnot DNS 3.4.11
dnsauth002.dg-w.de 2a03:fc0::NOERROR, 8 ms, authoritativenoyes / yesrefusedKnot DNS 3.4.11

Checks

  • ✓ All respond #14
    All 4 nameserver addresses answered.
  • ✓ All authoritative #15
    Every responding nameserver answers authoritatively for the zone.
  • ✓ No recursion #16
    The nameservers do not answer recursive queries for other domains.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: dnsauth001.dg-w.de: "Knot DNS 3.4.11"; dnsauth002.dg-w.de: "Knot DNS 3.4.11". Hide or replace the version string.
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✓ TCP supported #19
    All nameservers answer over TCP.
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 2026101901 · primary dnsauth001.dg-w.de

Found

Primary (MNAME)
dnsauth001.dg-w.de
Contact (RNAME)
hostmaster.deutsche-glasfaser.de
Serial
2026101901
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dnsauth001.dg-w.de (185.22.142.3)2026101901
dnsauth001.dg-w.de (2a00:6020:0:30::3)2026101901
dnsauth002.dg-w.de (94.31.64.49)2026101901
dnsauth002.dg-w.de (2a03:fc0::)2026101901

Checks

  • ✓ Serial 2026101901 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dnsauth001.dg-w.de is one of the listed nameservers.
  • ✓ Contact hostmaster@deutsche-glasfaser.de #25
    The SOA RNAME hostmaster.deutsche-glasfaser.de means hostmaster@deutsche-glasfaser.de.
  • ✓ Date-based serial #26
    The serial 2026101901 follows the YYYYMMDDnn convention (2026-10-19).

DNSSEC

warn

Not signed

Found

Validated by resolver
no

Checks

  • !
    Not signed
    The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.
    #27

Records

warn

19 records at the apex

Found

Read from
185.22.142.3:53
TypeValueTTL
SOAdnsauth001.dg-w.de. hostmaster.deutsche-glasfaser.de. 2026101901 10800 3600 604800 8640086400
NSdnsauth001.dg-w.de.86400
NSdnsauth002.dg-w.de.86400
A34.49.65.6160
MX0 deutscheglasfaser-de02b.mail.protection.outlook.com.300
TXT"MS=ms23124997"3600
TXT"_cwsqkd814krxpplnsqmsqr63uthndgz"3600
TXT"apple-domain-verification=u7QAIhqcELCbWzXq"3600
TXT"MS=E7E6DB21BAF20D7D90E998F8948E6C29A4FE7BE8"3600
TXT"docusign=ae5632f3-cd21-4ae2-a32e-38b2d99efb35"3600
TXT"docusign=c5ca5fcf-45bf-4f5b-a22c-a6c3e6138d94"3600
TXT"google-gws-recovery-domain-verification=46548518"3600
TXT"amazonses:LsWx33bpJw6IrTO6py6DOFmRy3/USHYr8ioLbmwmUR0="3600
TXT"facebook-domain-verification=h8xwv8rlb41giuppt6ezmdjbz7qzu3"3600
TXT"google-site-verification=KxSXOPbPA8nxuna7omaTARWv63HILsZat6M-OrOrSA4"3600
TXT"google-site-verification=VYraxYRBqVKrop_xjLg0C581G0MaCZZXJSEBrmsOTjI"3600
TXT"google-site-verification=gUiiCEhRTYu3sOPCgNVqkIDWB1r3TriJuObJf-NlnnI"3600
TXT"atlassian-domain-verification=PHeOgONCbPuVRX9mPWT4f/RHMZ56bnJ06DUMFN0BypjMmhj37seP0/ORODpMe/TM"3600
TXT"v=spf1 include:spfip1.deutsche-glasfaser.de include:spfip2.deutsche-glasfaser.de include:spf.protection.outlook.com a:b.spf.service-now.com a:c.spf.service-now.com a:d.spf.service-now.com include:spf.crsend.com include:_spf.salesforce.com a:mail.020epos.d" "e ~all"3600

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (1m). Low TTLs are useful just before a planned change.
    #32
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • ✓ No wildcard #34
    Names that don't exist return NXDOMAIN.
  • i
    No CAA records
    Without CAA records any certificate authority may issue certificates for this domain. A CAA record limits issuance to the CAs you use.
    #35